ext4-fast-commit · shipping · also Ext4 fast-commit journaling

Ext4 fast commit

Ext4 fast commit is a journaling mechanism that records metadata deltas for eligible updates instead of a full traditional metadata-block commit.

Linux v6.12 describes this for ordered mode, with fallback to full commits. [1] Replay targets recorded outcomes rather than blindly repeating procedures; the implementation also documents hardening work, so the design rationale is not a correctness certification. [2] See the explicitly synthetic interrupted-recovery model. [3]

Relations

related

journal-checkpoint, journal-revoke-record, crash-consistency, persistence-ordering

Limitations

• The cited Linux v6.12 mechanism and explanatory model do not certify a deployed kernel or storage stack. [3]

Citations

1. Linux v6.12: ext4 Journal (jbd2), layout and fast commits (accessed 2026-10-14)
2. Linux v6.12: fs/ext4/fast_commit.c, replay idempotence and stated limitations (accessed 2026-10-14)
3. Hesela: Ext4 journal replay, revocation and repeatable recovery (accessed 2026-10-14)

JSON: /data/terms/ext4-fast-commit.json